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F8261 acted as a “bridge” between PTFE and inorganic fillers resulting a tight contact between PTFE and fillers. As a result, the NST/GF/PTFE composite substrates exhibit an excellent dielectric properties.
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•Na1/2Sm1/2TiO3 (NST) ceramics were prepared by one process using the solid state method.•The surface of NST and glassfiber were successfully modified by C14H19F13O3Si (F8261).•The modified NST exhibits a high contact angle indicating a strong hydrophobicity.•Increasing NST contents will increase εr, tan δ and moisture absorption.•NST/GF/PTFE composite has a εr of 4.95 and a tan δ of 0.00147 at 4 wt% GF and 46 wt% NST filler loading.
A study on Na1/2Sm1/2TiO3 filled and glassfiber reinforced polytetrafluoroethylene (PTFE) composites was described. The GF content was a fixed value of 4 wt%, and the NST content in the composite matrix changed from 26 to 66 wt%. The paper consisted of the manufactural process of the composite and the effects of filler content on the properties of the substrate, such as morphology, moisture absorption, density, dielectric properties and temperature coefficient of dielectric constant. As NST filler loading increased from 26 to 66 wt%, the dielectric constant and loss tangent experienced a continuously increase while the development in τε was opposite. X-Ray Diffraction, FTIR and XPS were used to analyze the microstructure of modified ceramic powder. It was proved that the silane coupling agent has been grafted on the NST surface successfully. At last, the NST/GF filled PTFE composites exhibited good dielectric constant (εr = 4.95), low dielectric loss (tan δ = 0.00147), acceptable water absorption (0.036) and temperature coefficient of dielectric constant (τε = −164) at filler loading of 4 wt% GF and 46 wt% NST.